Some APIs return an empty response body to signal the client that there is no object. Retrofit's converters can trip over that, because it can be an invalid representation in their respective data format. For example, an empty object needs to be {} in JSON. In this tutorial you'll learn how …

In most cases, the server response payload to our request is the sole reason why we made the request. However, in some rare cases it doesn't matter to us at all. If you have an endpoint where you completely ignore the response payload (besides the status codes and headers), you …

In our introduction to response caching we've motivated developers to integrate response caching to make their apps faster and reduce the used bandwidth. Integrating response caches has another positive side-effect: you can add a simple offline mode to your app! If your user is in a dark tunnel, you might …

In a previous tutorial you've learned how you can activate Retrofit's response caching. In this tutorial we'll explore how you access the cache files and use them to analyze the app's network and cache behavior. This can be very helpful during the development phase. {{outline}} Access Cache Files Before you …

Retrofit has the fantastic capability of automatically mapping server responses, no matter if XML, JSON or protocol buffers, to Java objects. This is super convenient for us developers. Of course, if you want, you can always skip the mapping and work with the raw server response. However, in rare cases …

In the first Retrofit caching tutorial we've given you an overview on how caching works and what steps are necessary to enable it for Retrofit. We've skipped one important information: how can you detect whether a response came from the cache, the server, or even both? In this tutorial, you'll …

Every app developer has been in this scenario: the API has a weird or problematic behavior, but the backend developer or evil boss decides to fix it by a hack on the mobile app, instead of getting down to the root of the problem. In our introduction to response caching …

Internet servers and browsers have developed an advanced caching system to reduce the used bandwidth and make viewing websites much faster. However, when developing mobile apps we started to forget about these things. While image libraries like Picasso or Glide provide caching when loading and displaying images, Retrofit does not …